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US 12,771,401 B2Granted
Rake receiver and related methods
AssigneeL3Harris Technologies, Inc.
InventorsStephen A Laraway, David G. Landon, Edwin J. Hemphill, David S. Nelson
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Abstract
A radio frequency (RF) rake receiver may include a plurality of diversity receive paths, with each diversity receive path including a respective rake receiver despreader, and a tracking loop. The tracking loop may be configured to generate a composite timing signal based upon the rake receiver despreaders, and provide the composite timing signal to the diversity receive paths.
Claims22
A radio frequency (RF) rake receiver comprising:
- a plurality of receive paths, each receive path comprising a respective rake receiver despreader comprising a plurality of rake fingers;
- calculation circuitry coupled to the plurality of rake fingers of the respective rake receiver despreader and configured to generate a log-likelihood ratio (LLR) output for each rake finger, calculation circuitry comprising
- signal power measurement circuitry coupled to a respective rake finger of the plurality of rake fingers,
- a moving average filter coupled to the signal power measurement circuitry, and
- path selection circuitry coupled to the moving average filter;
- and
- a tracking loop configured to
- generate a composite timing signal based upon the plurality of rake receiver despreaders and the calculation circuitry, and
- provide the composite timing signal to the plurality of receive paths;
- and
- forward error correction (FEC) decoder circuitry configured to perform error correction on data received via the plurality of receive paths based upon the LLR output.
8 more elements
A radio frequency (RF) rake receiver comprising:
- a plurality of diversity receive paths, each diversity receive path comprising a respective rake receiver despreader, each rake receiver despreader comprising a plurality of rake fingers arranged in a non-sparse configuration;
- calculation circuitry coupled to the plurality of rake fingers of the respective rake receiver despreader and configured to generate a log-likelihood ratio (LLR) output for each rake finger calculation circuitry comprising
- signal power measurement circuitry coupled to a respective rake finger of the plurality of rake fingers,
- a moving average filter coupled to the signal power measurement circuitry, and
- path selection circuitry coupled to the moving average filter;
- and
- a tracking loop configured to
- generate a composite timing signal based upon the plurality of rake receiver despreaders and the calculation circuitry, and
- provide the composite timing signal to the plurality of diversity receive paths;
- and
- forward error correction (FEC) decoder circuitry configured to perform error correction on data received via the plurality of receive paths based upon the LLR output.
8 more elements
A method comprising:
- operating a plurality of receive paths, each receive path comprising a respective rake receiver despreader comprising a plurality of rake fingers;
- operating calculation circuitry to generate a log-likelihood ratio (LLR output for each rake finger wherein the calculation circuitry is coupled to the plurality of rake fingers of the respective rake receiver despreader, the calculation circuitry comprising signal power measurement circuitry coupled to a respective rake finger of the plurality of rake fingers, a moving average filter coupled to the signal power measurement circuitry, and path selection circuitry coupled to the moving average filter;
- and
- operating a tracking loop by
- generating a composite timing signal based upon the plurality of rake receiver despreaders and the calculation circuitry, and
- providing the composite timing signal to the plurality of receive paths;
- and
- operating forward error correction (FEC) decoder circuitry configured to perform error correction on data received via the plurality of receive paths based upon the LLR output.
5 more elements
A radio frequency (RF) rake receiver comprising:
- a plurality of receive paths, each receive path comprising a respective rake receiver despreader comprising a plurality of rake fingers;
- calculation circuitry coupled to the plurality of rake fingers of the respective rake receiver despreader and configured to generate a log-likelihood ratio (LLR) output for each rake finger, the calculation circuitry comprising
- signal power measurement circuitry coupled to a respective rake finger of the plurality of rake fingers,
- path selection circuitry cooperating with the signal power measurement circuitry and configured to exclude rake finger signal energy below a threshold level, and
- a moving average filter coupled to the signal power measurement circuitry and the path selection circuitry;
- and
- a tracking loop configured to
- generate a composite timing signal based upon the plurality of rake receiver despreaders and the calculation circuitry, and
- provide the composite timing signal to the plurality of receive paths;
- and
- forward error correction (FEC) decoder circuitry configured to perform error correction on data received via the plurality of receive paths based upon the LLR output.
8 more elements
Dependencies are inferred from the claim text.